Burner for liquid fuel



March 15, 1938. c. PULEJO ET AL BURNER FOR LIQUID FUEL 3 Sheets-Sheet 1Filed March 21, 1935 March 15, 1938.

c. PULEJO ET AL BURNER FOR LIQUID FUEL Filed March 21, 1955 3Sheets-Sheet 2 [aria 242/2, '0 and 721' {zaw/ March 15, 1938. c. PULEJOET AL I BURNER FOR LIQUID FUEL Filed March 21, 1935 3 Sheets-Sheet 3 7is a fragmentary sectional view taken hand-wheel I00.

Patented Mar. 15, 1938 UNITED STATES PATENT ()FEIQE BURNER FOR LIQUIDFUEL Carlo Pulejo and Jean Staub, Lausanne, Switzerland ApplicationMarch 21, 1935, Serial'No. 12,296 In Switzerland March 28, 1934 V 1Claim. (01. 158-436) The present invention relates to a burner de- A'needle valve i cooperates with the tubular vice of the nozzle type formazout and other member 3 to control the flow of the air. liquid fuels.The tubular valve body 3 is carried by a tubu- An object of thisinvention is to provide a lar sleeve Il2'having external threads I03engagburner for liquid fuel having a combustion chaming theinternalthreads of a bushing I201) sup- 5 ber provided with a burner nozzleoperative ported in boss I20a. A hand wheel I05 is fixed to therein,means for supplying regulated amounts sleeve 3a and serves to regulatethe position of of fuel and spraying medium, and means for pre valve 3.heating the fuel and spraying medium. Sleeve H2 is internally threadedto receive the The annexed drawings show diagrammatically threadedportion I04 of needle valve I. A hand 10 and by way of example severalforms of construcwheel I06 serves to adjust the position of Valve I.tion of the invention. Threads I03 and I04 are of opposite pitch soFigure 1 is an elevational view partly in secthat by rotating wheel I05while holding wheel tion of an apparatus embodying the present in- I06stationary, the flow of liquid may be invention. creased, whereas theflow of air will be decreased, 15

Fig. 2 is a vertical sectional view of the burner. and vice versa. IFig. 3 is a fragmentary sectional view taken-on The fuel regulation isindicated by a dial I0! line 3-3 of Fig. 1. on the casing and a hingedindex-hand I08 on Fig. 4 is a fragmentary sectional view taken on thehand-wheel I05, which index hand can be set line 4-4 of Fig. l. to zeroby rotating a disc I09 relatively to the 20 Fig. 5 is a fragmentarysectional view taken on hand-wheel. A dial I I0 for indicating theatomline 5-5 of Fig. 1. r ized liquid fuel is integral with thehand-wheel Fig. 6 is a fragmentary sectional view taken I05 andcooperates with an index hand III which on line 0-0 of Fig. 1. can besetto zero by turning it relatively to the on line 'I--'I of Fig. 1.These indicators can be set when the locking Figs. 8a, 8b, 8c and 8d aresections of the valve nuts 89 and 90 are loosened.

plug taken on planes passing through the ports When the nuts 80 and 90are tightened the two thereof. hands move with their knobs. The sleeveH2 Fig. 9 is afragmentary sectional view taken on engaging the screw I04is held stationary by 30 line 9-9 of Fig. 1. means of teeth H3 on saidsleeve which are in Fig. 10 is a fragmentary sectional view taken meshwith the teeth of a segment II4 mounted on line I0I0 of Fig. 1. on aspindle H5 which is eccentric for the pur- Fig. 11 is a fragmentary viewof the regulating pose of releasing the segment H4 from the teethmechanism for the burner. H3 when it is desired to clean the burner orto 35 As shown in the drawings, the present invenchange the needlevalves. The rotation of this tion comprises an assembly including aburner spindle H5 is effected easily by a lever H0 upon nozzle, a fuelpreheater and an injector, which loosening a lock nut II'I. assembly ismounted in an opening in the wall A diffuser H9 is arranged co-axiallywith the 0 I22 of a furnace. The burner proper (Fig. 2) needle: valveassembly and can be given a move- 40 comprises a housing I20 having aboss I20a. in ment of translation by means of a screw and nut which ismounted the burner nozzle Ia. This device H8 (Fig. 1) actuated by anexternal handnozzle communicates with a chamber I02 to wheel. Ignitionis obtained by means of spark which liquid fuel is supplied through aduct I02a plugs I30 and I3l.

5 (Fig. 10) fed by a duct 802?] Which communicates A lever I32 indicatedin Fig. 11 is arranged to by duct I020 withaport I02d (Figs. 5 and 6). Arotate the segment I I4, thereby actuating the tubular valve body 3cooperates with nozzle Ia, needle valves I, 3 automatically anddifferentialto control the flow of liquid fuel from chamber ly, whichlever is moved by a thermostat (not I02 through nozzle Ia. shown) inwell-known manner.

Air or other atomizing medium is supplied to Fig. 1 shows the connectionto the burner cas- 50 chamber I0! in boss l20a by duct mm which ing I20of a row of annular preheating elements communicates through ducts I DIDand IOIc (Figs, I200 with the inter-position of gaskets 30 of 5 and 10)with port "lid (Fig. 6). From chamcopper, for example. ber IOI air flowsthrough port IOIa into the tu- The axial opening of these elements I200forms bular valve 3 and out through its tapered end. a continuation ofthe space in h burner cas- 55 ing I20. Between the last element I200 andthe wall I22 of the boiler associated with the burner is an injectorwith a disc valve I2I for regulating the admission of additional air,said disc having radial grooves the effect of which is to divide up theair into small quantities and to heat it by contact with the injectorbefore said air comes into contact with the flame. The assembly ofburner, preheater and injector is removably attached to the boiler, asis clearly indicated in Figs. Sand 4, by means of tapered rods I23engaging bores in lugs I24, this arrangement constituting a hingedfitting.

The preheater element adjacent the housing I20 has an inlet I25 (Figs.1, 6 and 7) for the liquid fuel, an inlet I26 for the atomizing medium,and internal circulation conduits for these media. The arrows in heavylines indicate circulation in the elements for the fuel to besuperheated and the arrows in thin lines indicate the circulation of airor vaporized oil for atomization. In the base of the preheater is acook, the plug SI of which has a bore 93 and sets of ports 94, 95, 96and 91 for the purpose of varying the effect of the preheater elementsI20c.

Liquid fuel, such as oil, is fed through conduit 92 provided withcontrol valve 33 through inlet I25 of the first preheater section intochannel M. The oil flows through channel M to return member 42 formed inthe element I200 at the other end of the preheater and back throughchannel 43. With valve plug 9| in the position shown in Figs. 7, 8w, 8b,8c and 8d, the oil will flow then through duct 44 and port 94 into bore93 and out through port 91 into duct I020 which communicates withchamber I02.

If valve 9| were rotated 90 clockwise from the position shown in Fig.81), then the oil would flow from channel 43 into return chamber 45(Fig. 6) through channel 46 to return chamber 47 (Fig. 9) and backthrough channel 48. From channel 48, the oil would then flow throughduct 49, through port 95 into bore 93 and out through port 91 to ductI020.

Obviously, if the plug 9| were rotated 180, the oil would have to flowalso through return 50 (Fig. 6), channel 5|, return 52 (Fig. 9), channel53, duct 54, through port 96, bore 93 and port 91 to duct I020.

With the plug 9I rotated 270 clockwise, the oil would flow additionallyfrom return 55 (Fig. 6) through channel 56, return 51 (Fig. 9), channel58, duct 59, one of ports 91, bore 93, and another of ports 91 to ductI020.

The device may be constructed with provision for adding or taking awayone or more of such elements according to need, the first and the lastbeing alone indispensable in all cases.

The atomizing medium, which may be air or liquid fuel, is introducedinto the preheater at I26 and is passed back and forth through theserially connected channels 98 and is discharged through duct IOIc whichcommunicates with chamber IOI.

When the liquid fuel isto be vaporized and used as an atomizing medium,it is distributed to the preheater elements in the required quantity byneedle regulation devices 92 placed in the upper parts of the elements(Fig. 7). An inspection hole I21 consisting of a disc of trans parentmaterial permits the checking of the flow of superheated oil forgasifi'cation.

Oil pumps, compressors and other usual machines can, of course, beutilized for the circulation of the two fluids.

We claim:-

A burner for liquid fuel, comprising an openended combustion chamber, anozzle positioned to discharge a spray of liquid fuel into one end ofsaid combustion chamber, means for supplying liquid fuel and a sprayingmedium to said nozzle, means for controlling the supplies of liquid fueland spraying medium to said nozzle, and

means for preheating the fuel and the spraying medium, said preheatingmeans comprising a plurality of elements forming part of the wall of thecombustion chamber, said elements each having separate circulationchannels therein, and a multiple-way cock connected to the channels andhaving means for controlling the circulation through the channels insaid elements whereby certain of the channels can be brought into andcut out of operation.

CARLO PULEJO. JEAN STAUB.

